CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock
Balance at Dec. 31, 2018	$ 1,211,600,000	$ 900,000	$ 1,545,900,000	$ (224,200,000)	$ (111,000,000.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,700,000)			(2,700,000)
Loss from continuing operations	(2,700,000)
Other comprehensive loss, net of tax	4,800,000
Other comprehensive loss, net of tax					4,800,000
Stock-based compensation expense	6,700,000		6,700,000
Common stock issued for exercise of stock options and other	900,000		900,000
Tax on restricted stock unit vesting	(4,800,000)		(4,800,000)
Balance at Mar. 31, 2019	1,216,500,000	900,000	1,548,700,000	(226,900,000)	(106,200,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	200,000
Treasury Stock, Value	0
Balance at Dec. 31, 2019	1,288,500,000	900,000	1,574,700,000	(175,100,000)	(112,000,000.0)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(9,100,000)
Loss from continuing operations	(12,800,000)			(12,800,000)
Other comprehensive loss, net of tax	(8,700,000)				(8,700,000)
Other comprehensive loss, net of tax					(8,700,000)
Stock-based compensation expense	3,500,000		3,500,000
Common stock issued for exercise of stock options and other	400,000		400,000
Tax on restricted stock unit vesting	(5,800,000)		(5,800,000)
Balance at Mar. 31, 2020	1,253,800,000	$ 900,000	$ 1,572,800,000	$ (184,200,000)	$ (120,700,000)	(15,000,000.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Value, Acquired, Cost Method	15,000,000.0					$ 15,000,000.0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	200,000
Treasury Stock, Value	$ 15,000,000.0